Description du projet de recherche

This Ph.D. project develops a phenomenological framework for dry‑mix shotcrete that links observable field behaviour to in‑situ rheology, finite‑element modelling, and placement simulation. Through field and laboratory work, we experimentally confirm a transient “fluid zone” at the receiving surface during spraying. The measurements indicate that the freshly impacted surface softens for a brief interval, and that this phase aligns with the initiation of rebound. It therefore defines practical early‑age response targets for material and process control. On‑site tests provide boundary conditions, while Abaqus models and a placement simulator explore mass distribution, angle, velocity, and automated trajectories under repeatable scenarios. Together, the evidence and models translate into practical guidance for nozzle selection, spraying paths, and mix adjustments for automated or manual placement. The outcome is a concise basis for predicting and improving rebound, encapsulation, and surface quality in repair and tunnelling, with benefits for cost and environmental performance across site conditions.